Gas-cut-off valve.



- `o. A. GIPPEN.

GAS CUT-OFF VALVE.

APPLICATION FILED NOV.13, 1907,

919,155. Patented; Apr.2o,19o9.

1 SHEETS-SHEET 1.

Wi h1 con:

fluente i 0. A. GIFFEN.

GAS OUT-OFP VALVE. .APPLIOAT-ION FILED NOV. 13, 1907. 919,155, Patented Apr.2f 19o9.

` cal section through the device.

. main valve.

UNITED STATES: PA'ENT OFFFQQEQ OTTO A. GIFFEN, OF HANOVER, OHIO.

GAS-CUT-OFF VALVE To all whom it may concern.:

Be it kn ovvn that I, O'r'ro A. GiFFnN, a c1tizen ot the United States, residing at llanover, in the county of l'iicking, State of Ohio,

have invented certain new and useful .lm-

novements in Gas-Cut-Oll Valves; and I do lierehv declare the following to be a full, clear, and exact description olE the invention, such as will enable others skilled in the art to which it appertains to make and use the saine.

'lhe present invention has reference to cutoll' valves for gas-supply systems, and it aims, generally, to provide an exccedingbv simple, inexpensive, and effective device ol' that nature adapted to automaticalhv shut oil.' the entire suppl)r of gas from the burners, should the pressure become so lon' as to fail to support combustion at the burners, and to remain in its closed position after the presA sure rises, until opened manually.

'The invention further resides in the pro vision ol a supplemental cuteoll valve the interior ol whose easing' is in connnunication with that ot the main valve, this supplemental valve beinfr closed automatically by the gas escaping troni the inlet chamber ol the main valve n'hen the pressure `of the gas suddenlj,v rises after having fallen to an extent sullieient to permit the closure of the rl`he invention still further resides in the particular construction of the main valve -asing and its plug, in which latter the upper valve seat is formed; in the particular means provided for raising vthe main valve into its open position in such seat;` and in the construction of the supplemental valve` and its casing, and the manner of connecting the saine with the casing of the main valve` The invention will be readily understood from a consideration ot the following detailed description, and its preferred embodiment is illustrated in the accompanying dra wings in n'hic-h like parts, or features, as the case may be, are designated by corresponding reference numerals in the several viens.

Of the said (lrau'in 0's:-l `igure 1 is a verti- Fig. 2 is an enlarged section through the lug. Fig. 3 is an enlarged section through t ie easing of the supplemental valve, showing the latter in place therein. Fig. 4 is an enlarged section through a modied form of plug and the valve used in connection therewith. Fig. 5

Specification of Letters Patent. application filed November 13, 1907.

Patented April 20, 1909,

Serial No. 401,995.

is a detail vien' ot erating rod.

.Referring more partieulz'irlvv to the drawings, 7 designates, eenerally, the main valve easing which forms a union with the tivo sec tions of the service pipe, not sheen, the left hand section supplying gas to the burners. rthe casing is provided with the usual S- shaped partition 9 which divides the interior of thc easing into upper and lower compartments l() and il and has-an opening 1.12 formed through the central or horizontal portion thereof, such opening serving as the lower seat tor 'the valve i3, which latter is, in the main, similar to a check-valve, and includes a central hed)v portion and vertical guide'arms formed in opposite sides thereof.

The top of the easing is provided with a threaded opening adapted to receive the siem of a plug 14 having' a vertical passage .t formed therethrough, the under eut lower end 16 of the stem forming the upper valv seat, the upper arms of the valve extending into said passage when the valve is in its raised or open position. The stem is further provided at its lower end annular shoulder 17, which is formerl on the outer edge thereof, shown in Fig. 2, and thus serves as a easing for the seat 16, preventing bodily sidevfise movement. ot' the valve, when raised thereinto, and its consequent `displaeemt-ait therefrom when the casing is subjected to an;T vibrations. rPhe upper portion of the passage .l5 is likewise threaded, and is adapted to receive, the lower end el a pipe section "1S vto which the casing 19 ofthe suinileniental valve 20 is connected. This casing is likewise divided into upper and loner compartments by a partit-ion 2T provided with an opening 22 forming a seat for the valve when the latter is in its raised or closed position.

'l`he bottoni of the main casing 7 is provided \vith a depending shoulder 23 having a threaded vertical 'nass-age formed therethrough and communicating at its upper end with the lower compartment l1. ,Through this passage extends a threaded rod 24 whose modified forni of the opvfith a depending' outer end has secured thereto a hand Wheel 25 by means of which the rod is turned in one direction or the other, to ei'leot an endwise movement thereot'.- rlhis rod serves as' a means for raising the main valve 13 into its open position, or, in other Words, into its upper seat 16, wherein it is heldI by the' pres` sure of the gas until such pressure decreases to an extent sutlicient to permit the valve to fall of its own weight into its lower seat 12. In the preferred construction of the rod, its length is such that its up er end may be moved into contact with t e under face of the valve body, whereupon a further upward movement of the rod will carry the valve into its upper seat. In the modiiied construction shown in Fig. 5, the rod, at the limit of its upwardY movement, terminates short of the valve which latter rests upon the upper end of an cxpansiblei coil-spring 2G whose lower end is made fast to the upper end of the rod, the spring thus exercising an upward pressure against the valve, as will be apparent. In both constructions the downward movement of the rod is limited and its complete removal prevented by the provision of a shoulder 27 formed integrally upon the rod intermediate the ends thereof. A certain limitation of the upward move.- ment of the rod is likewise elleeted by the provision of a packing nut 28 which is ad- ]ustable upon the threaded portion of the shoulder 23 and has an opening through which the rod extends. 'ihc position of this nut, against which the wheel 25 contacts when the rod has been advanced a certain distance, therefore regulates the extent of such advance, as will be apparent, it being thus possible to prevent theI valve from being moved too forcibly into its upper seat. The same effect is accomplished by the use of the spring.

In the o eration of this form of the device,

- the norma pressure of the gas beneath the masinvalvc will hold the latter in its raised or open position, the gas being thus free to pass through the opening 12 and through the lower compartment 11. to thel supplyr pipe for the burners until the pressure decreases to an extent suilicint to )ermit the valve to fall of its own weight and iit in said opening, thus cutting oit' any further sup ly to the burner pipe. rl'he pressure of tie incomin? gas 1s msullicient, however, to raise the valve 20 into its closed )ositiotn so that the gas is free to pass throug the opening 22 into the uiper compartment of the casing, from which it exhausts through the mouth of a turn-cock 29 carried by said casing. When the gas pressure again rises to normal the main'valve will be retained in its lclosed position by the pressure thercu ion, and the valve20 will likewise be raised into closed position by the pressure therebeneath. 'l`he rod 24 is then moved upwardly by means of its hand wheel 25, so as to raise the main valve into its upper seat, whereupon the gas is again free to owinto the burner` pipe, the supplemental valve being returned to its normal position after the main valve has risen.

In the modified construction shown in Fig.

l 4, the supplemental casing 19 and the pipe section 18 are replaced by a cap or dome 30 whose threaded stem tits in the upper end of the passage 15 in the plug. The fiat under opening adapted to receive the upper end ol a cylindrical valve casing 31 within the bore of which is disposed the stem of a valve 3 the lower end ofthe valve stem resting u n an expansible coil-spring 33 likewise iitted in said bore, which latter is reduced at its lower end. rl`l1e`ilat head of the valve 32,is thus held normally above the up er end ol' the casing, such movement being imited by ed to extend across the valve head. he lower end of the last-mentioned casing carries a turn-cock 35 threaded thereinto, although this element may be dis )osed opposite the casing with-its stem litted in an opening formed in the cap bottom. The operation of the modiiied construction is similar to that of the preferred form and therefore requires no further illustration. lt is to be understood, however, that thccap 30 isitself a -su plcmental casing provided with an interiorly-located valve, so that the term supplemental casing occurring in the claims may refer with equal )roprietyto both the preferred and the modi led construction.

The end ol the inlet ipe whiclris fitted in the main casing is pre erably provided with a screen ot wire gauze secured thereto inany desired manner for preventing the entry of any foreign matter with the gas into the casing. t

What is claimed isz-f 1. In a gas eut-olli, the combination, with a casing provided with a partition having a valve seat formed therein, of a plug iitted in the top of the casing and having a valve seat formed in its lower end, a valve movable between said seats and adapted to seat in one or the other, and a threaded rotatable rod extending through the bottom of the casing and provided with a resilient member adapted to contact with the valve, to raise the valve from its lower seat into its upper seat.

2. In a gas cut-oil', the combination, with a main casing provided with an inlet and an ing communicating with the inlet compartment and with the atmosphere, a main vertically-movable pressure-o eratcd valve for cutting oli' communication etween the inlet compartment and the supplemental casing when the gas pressure is normal, and between the inlet and outlet compartments when the pressure falls below normal, a pressure-operated valve located within the 'supplemental casing for cutting ol` communicad'uent y ,rises to normal, an a threaded rotatable rod extending through the bottom of face of this cap is provided with a threaded l a finger 34 having a lateral projection ada t' outlet compartment, of a supplemental cas-- tion between the inlet compartment and the. atmos here when the gasprcssure subsethe main casing, for raising said main valve, in the last-mentioned instance, to re-open communication between said inlet and outlet compartments.

3. In agas cut-off, the combination, with.

a main casing provided with an inlet and an outlet compartment, of a supplemental cas- -ing communicating with the inlet comparte ment and with the atmosphere, a main vertically-movable pressure-operated valve for cutting off communication between the inlet compartment and the supplemental casing when the gas pressure is normal, and between the inlet and outlet compartment when the pressure falls below normal, a pressure-operated valve located within the supplemental casing for cutting off communication between tlie inlet compartmentA and the atmosphere when the gas-pressure subsequently rises to normal, andan endwise movable rod extending through the bottom of the main casing and rovided with a resilient member located wit iin .the interior of said ,casin and adapted to contact with said main va ve I'prraising the same, in the last-mentioned instance, to. re-open communication betiwee'n said inlet and outlet compartments;

4. In a gasIcut-oi, the combination, with a main casing 4provided with an inlet and an outlet compartment, of a supplemental casing communicating with the inlet compart- Vment and With the atmosphere, a main vertically-movable pressure-o erated valve for cutting o'l" communication etween the inlet compartment and the supplemental casing when the gas pressure is normal, and between the inlet and outlet compartments when the', pressure falls below normal a pressure-operated valve located within ithe supplemental casing for cutting o cmmunication between the inlet compartment and the atmosphere when the asressure subse uently rises to normal, an a t readed rotata le rod extending through the bottom of themain casing an provi ed with a re silient member located within the-interiorof said casing and adapted to contact with said main valve, for raising the same in the lasti mentioned instance, to re-open communica tion between said inlet and outlet compartments. v

5. In a gas cut-off, the combination, with l bored valve casing carried by the supple mental casing', a valve including a head portion adapted to restl u on one end of the' valve casing to close t e boieand a stem extending into the bore, a spring disposed within the bore and bearin against the inner end of the stem, to norma ly force the valvev head away from said valve casing, and a member extending across the path of movement of the valve head, to limit such movement.

In testimony whereof, I aillx my signature, in presence of two witnesses.

oTTo a. GIFFEN.

Witnesses:

GEORGE HOLLISTER, LAURA HoLLIsTnR. f 

